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merge rusEFI wiki

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Firmware-update-via-CAN.md
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## technical info
STM32 hard-coded bootloader support CAN firmware update but only on specific hardware pins PB5 PB13 which conflict with SPI hardware pins, weird not great option for us.
http://www.feaser.com is an open source bootloader which allows CAN firmware update via pins. feaser uses it's custom (?) update protocol using two CAN PIDs.
[OpenBLT GNU GPL Bootloader](http://www.feaser.com) allows CAN firmware update via any CAN pins. OpenBLT uses it's custom (?) update protocol using two CAN PIDs.
This was tested on https://www.peak-system.com/PCAN-USB.199.0.html?&L=1
This was tested using https://www.peak-system.com/PCAN-USB.199.0.html?&L=1 hardware
Open question how popular is PCAN. Looks like https://github.com/moonglow/pcan_cantact turns stm32f042 boards into PCAN. Maybe even https://canable.io/?